badassbusaboy
Registered
Will someone please dyno one already. Only way to find out.
Secondary Butterflies removal review
- Thread starter Dozerdriver
- Start date
He said he was going to.
I think you better reflash your ECU with smithbusa interface and set the secondary plates to a 100% open because upper injectors hit the secondary to guide fuel with an angle that they have to the head if you remove them the fuel will hit the intake tube wall and that will cause turbulance you could lose power.
Dozerdriver
Registered
Since HPC closed shop I don't think he has a dyno close by anymore.
The BUSA isn't like a 14 so I'd be surprised if you see anywhere close to those gains...
There are other dyno shops but Greg liked to experiment with these kinds of things... it was always fun at his shop. I think I will go to Cycle Connection soon and see how there shop is.
Blckbrd
Registered
OK - so i went to the dyno yesterday. Frank at Powerhouse Motorcycles in West Babylon, Long Island, is awesome ... a true gentleman and a scholar, and a perfectionist ... the kind of guy you want dialing your bike in. Well worth the ride from across the Long Island sound.
It was a hot and humid day - about 85F and 80% humidity, so the dyno numbers are SAE. Actual #s woulda been a lot higher in October.
I've got an 09 with a full Yosh R77 and a BMC filter & secondary's removed. Baseline pull was 175.4 hp at 9800 and 107.4 tq at 7200.
After Frank's loving attention to a/f and also his flashing the ecu to remove timing restrictions, speed restrictions, raising the rpm limit a smidge, and disabling the pair, it pulled 189 hp at 10,200 (185 at 9800) and 112.4 tq at 7200.
I will post scans of the charts to compare the before and after. For a true comparison as to what effect, if any, removing the secondaries has, we need someone with my common mods (r77 and filter) to post their dyno run for comparison.
I gotta say, I can't believe anyone who has removed their secondaries didn't notice the obvious difference in power down low. The night before dyno when I removed the secondaries & then took it for a test run, it was crystal clear that the bike had far more power available to it @ 2500 rpms on up whereas before, that front tire lifting pull wouldn't kick in till at and over 5000. Definitely a huge difference. The ride to the dyno tune the following day confirmed and reinforced this .... front wheel lifting in 1st thru 3rd without even trying. I cannot understand or agree with the nay-sayers.
Pictures are worth more than words .... I'll post when I get to the scanner in the office @ 1230 today.
It was a hot and humid day - about 85F and 80% humidity, so the dyno numbers are SAE. Actual #s woulda been a lot higher in October.
I've got an 09 with a full Yosh R77 and a BMC filter & secondary's removed. Baseline pull was 175.4 hp at 9800 and 107.4 tq at 7200.
After Frank's loving attention to a/f and also his flashing the ecu to remove timing restrictions, speed restrictions, raising the rpm limit a smidge, and disabling the pair, it pulled 189 hp at 10,200 (185 at 9800) and 112.4 tq at 7200.
I will post scans of the charts to compare the before and after. For a true comparison as to what effect, if any, removing the secondaries has, we need someone with my common mods (r77 and filter) to post their dyno run for comparison.
I gotta say, I can't believe anyone who has removed their secondaries didn't notice the obvious difference in power down low. The night before dyno when I removed the secondaries & then took it for a test run, it was crystal clear that the bike had far more power available to it @ 2500 rpms on up whereas before, that front tire lifting pull wouldn't kick in till at and over 5000. Definitely a huge difference. The ride to the dyno tune the following day confirmed and reinforced this .... front wheel lifting in 1st thru 3rd without even trying. I cannot understand or agree with the nay-sayers.
Pictures are worth more than words .... I'll post when I get to the scanner in the office @ 1230 today.
yep i agree, congrats on the new found power from tuning etc by the way 
Have fun on the beast
Have fun on the beast
Blckbrd
Registered
There is no doubt that more power was found by virtue of tuning the ecu and PCV. I also have no doubt that, prior to tuning and immediately after removing the flies, the engine delivered power sooner. I'm not sure that removing the flies gives overall more power, but I have no doubt whatsoever that it makes more power available sooner ... ie at lower rpms.
Unfortunately with the dyno graphs, they don't start to register until over 4k anyway, and we are talking about a difference from 2k - 5k. So I'm not sure that the typical dyno will show anything to lend insight into this issue. I've attached mine anyway ... sorry they're sideways ... just rotate the view.
Unfortunately with the dyno graphs, they don't start to register until over 4k anyway, and we are talking about a difference from 2k - 5k. So I'm not sure that the typical dyno will show anything to lend insight into this issue. I've attached mine anyway ... sorry they're sideways ... just rotate the view.
This is an OLD trick..just not popular in the busa....not more power available, just the delivery down low.On the 14 (prior owner, yeah thats right!) this was done because the secondaries opened at a higher RPM, hence, bottom end was a bit in the lacking side and limp, 06-07 models (only in drag racing really, on the street it really was not big difference) In 08 they got revamped and secondaries opened in a mre linear way early in the RPMS, this does require tuning though....on the busa....dont think its really needed....and it would require tuning as well as.
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At 60 mph, your speedo indicated 64, at 80 it indicated 88, and when the bike was doing 100 mph, your speedo indicated 110 . . .
Johnnycheese
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yes you can start a graph as low as idle
Blckbrd
Registered
At 60 mph, your speedo indicated 64, at 80 it indicated 88, and when the bike was doing 100 mph, your speedo indicated 110 . . .
Yeah ... that customary 10% inflation factor. Shoulda grabbed that speedo healer from you while I was there. Thanks again for the great tuning. It rides so much smoother! Especially with the crank case breathing again.
r1d3on3
Registered
Picking up the front wheel in 3rd nat asp? What is your gearing? Should have tuned w/ secondaries in and all the other changes you stated, then pulled the secondaries out to find where and if it made any differences. Having the bike tuned by someone that knows their stuff will make a day/night difference for sure.
Blckbrd
Registered
Picking up the front wheel in 3rd nat asp? What is your gearing? Should have tuned w/ secondaries in and all the other changes you stated, then pulled the secondaries out to find where and if it made any differences. Having the bike tuned by someone that knows their stuff will make a day/night difference for sure.
It's an '09 so it's not naturally aspirated. Stock gearing, and yes ... without any other changes being done, just taking out the secondaries and before tuning made a noticeable improvement in throttle response and down-low grunt ... much more pull from 2000 through 5000.
Yes - I had it tuned and that made a world of difference. But before tuning it, I pulled the secondaries out & rode it around for a bit ... drove it like I always do .. like I stole it. And yes, I have no doubt that simply, only, and just pulling the secondaries freed up the previously mushy lower rpms.
I gotta ask ... has anyone taken out the secondaries and NOT noticed a huge difference?
I'm guessing you meant, "Its naturally aspirated."
BigBadBusa08
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I found it was easier to remove the screws with a larger headed screwdriver. I tried using a small one like one for glasses, but i almost stripped them. When i used a fairly large screwdriver, they came out no problem
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